The escape is attributed to what Jesus gave as recorded in Luke in the Temp[le Discourse which happened during the same day that the Olivet Discourse later happened. Te passage in Luke also parallels much of the Olivet Discourse which in Matthew’s Gospel account is a discourse given to Jews concerning the JEWISH endtimes, not for the Church. Jesus did not introduce the Church until later int he week, as recorded in John 14.
It is very remarkable, and I have more than once called the reader’s attention to it, that not one Christian life was lost in the siege and destruction of Jerusalem. Every Jew perished, or was taken captive; all those who had apostatized, and slunk away from Christianity, perished with them: all the genuine Christians escaped with their lives. This very important information, which casts light on many passages in the New Testament, and manifests the grace and providence of God in a very conspicuous way, is given both by Eusebius and Epiphanius. I shall adduce their words: “When the whole congregation of the Church in Jerusalem, according to an oracle given by revelation to the approved persons among them before the war, were commanded to depart from the city, and inhabit a certain city which they call Pella, beyond Jordan, to which, when all those who believed in Christ had removed from Jerusalem, and when the saints had totally abandoned the royal city which is the metropolis of the Jews; then the Divine vengeance seized them who had dealt so wickedly with Christ and his apostles, and utterly destroyed that wicked and abominable generation.”